Our Lady was created actually “Full of Grace” as the Archangel Gabriel declared at the Annunciation, meaning that her soul was literally adorned with all of the virtues at the moment of her conception, as well as the gifts and fruits of the Holy Spirit. This fullness of grace is said to emanate from the center of her being, that is, her heart, understood both physically and spiritually. It is Mary’s heart, in its unspoiled created perfection, that is the source and wellspring of her purity . . . therefore her heart is called Immaculate.
This beautiful prayer of consecration to the Sacred Heart of Jesus was written by St. Margaret Mary Alocoque (1647-1690), the French nun and mystic who promulgated the Sacred Heart devotion, in a letter of spiritual direction to a fellow religious sister, Sister Felice-Madeleine de la Barge, at the Moulins monastery in France.